The 900 is a 2½-revolution (900 degrees) aerial spin performed on a skateboard ramp. While airborne, the skateboarder makes two-and-a-half turns about his or her longitudinal axis, thereby facing the other way when coming down than before. It is considered one of skateboarding's most technically demanding tricks.
|“||Well, he was shown in a video almost 10 years ago. He was really close, but he didn't make it. He came the closest by far, but they cut the video before he fell. So it may have misled some people. There are only five people who have been able to spin completely and he's one of them. Tas Pappas and Rob Boyce also have spun it, but they haven't landed it. We've all been trying it and killing ourselves.||”|
Tony Hawk 
Tony Hawk, one of the most successful vertical pro skateboarders in the world, landed "The 900" at the 1999 X-Games after ten failed attempts. It was past regulation time but, as one announcer said, "We make up the rules as we go along. Let's give him another try." None of the other skaters protested. Hawk twice landed on his board, but it flew out from under him. When he finally completed the trick, his arms windmilled and his hand barely grazed the ramp.  Nonetheless, he rode away. He was awarded 1st place in the "Best Trick" event despite going over the time limit. At a later X-Games, Hawk landed the trick again, this time during regulation time. In his book, the 900 was the last on wishlist of tricks Hawk had written a decade earlier. Other tricks on the list included the ollie 540, kickflip 540, and varial 720. In a 1999 interview, Hawk said he does not have "any desire to spin further".  He did, however, successfully land the trick during press interviews for the video game Tony Hawk: Ride and at the "Tony Hawk: RIDE Presents Stand Up for Skate Parks" event. Even in 2011 Hawk was still able to land his famous 900 and posted a video of the trick via his Twitter account stating "I'm 43 and I did a 900 today."
Other sports 
The 900 can also be attempted on a BMX bike, skis, snowboard, scooter or in-line skates. BMX-Rider Mat Hoffman was the first person to successfully land the 900 on film at a competition in Canada in 1989. At the 2002 X Games, Hoffman took the trick a step further by landing a no-handed 900. Simon Tabron's signature trick is the 900. In the 2007 X Games 13 Simon Tabron landed the first back-to-back 900s.
Because the gear of snowboarders, skiers, or inline skaters is affixed to their feet, the 900 is not considered to be a difficult trick for professionals in those sports and is performed rather often. A 1440 and 1800 degree spin has been landed on skis, 1260 have been landed on inline skates, 1080 on bmx, 1080 on scooter.
Successful landings 
- Tony Hawk, July 1999, X-Games, San Francisco, California (USA)
- Giorgio Zattoni, April 2004, Marianna HC, Ravenna (Italia)
- Sandro Dias, May 2004, Latin X-Games, Rio de Janeiro (Brazil)
- Alex Perelson, July 2009, Maloof Money Cup, Costa Mesa, California (USA)
- Bob Burnquist, first fakie to fakie 900, August 2010 Mega Ramp,(USA)
- Mitchie Brusco, July 2011, Nescau MegaRamp Invitational, São Paulo (Brazil)
- Elliot Sloan, October 2011, Maloof Money Cup, South Africa
- Tom Schaar, October 2011, MegaRamp Woodward West, Tehachapi, California (USA)
- Zac Rose, April, 2012 at Rye Airfield, NH (USA) 
- Jonathan Schwan, April, 2013 at MegaRamp Woodward West, Tehachapi, California (USA)
- 1999 Summer X Games: Chat wrap: Hawk soars to legendary status
- Twist and Shout at the X Games
- "Tony Hawk 900 in Linkoping Sweden". Shredordie.com. Retrieved May 19, 2011.
- "The 25 Best BMX Performances in X Games History: 1. Mat Hoffman, No-Handed 900, 2002 X Games in Philadelphia". Jul 28, 2011. Retrieved March 16, 2012.
- "14-year-old Mitchie Brusco lands MegaRamp 900 in Sao Paulo, Brazil". ESPN.com. July 7, 2011. Retrieved March 16, 2012.
- "Elliot Sloan lands first 900 tailgrab on MiniMega at Maloof South Africa". ESPN.com. October 2, 2011. Retrieved March 16, 2012.
- "12-year-old Tom Schaar youngest skater to land 900". ESPN.com. October 17, 2011. Retrieved March 16, 2012.
- "Jono Schwans 900 on the Woodward West MegaRamp". woodwardwest.com. April 8, 2013.